Donald Trump has resumed criticizing Megyn Kelly, threatening to disrupt the fragile, on-again-off-again truce between himself and Fox News. Trump took to Twitter during Kelly's Thursday night broadcast to criticize her guests, as "dumb puppets." He also claimed that he didn't watch her show -- which is doubtful, given his tweets -- and retweeted users who disparaged the program. Trump kicked off Thursday night's tirade by targeting Kelly's guests, Fox News digital politics editor Chris Stirewalt and former George Bush speechwriter Marc Thiessen, who now serves as a columnist and Fox News contributor. "Megyn Kelly has two really dumb puppets,...